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[topcoder]TheConsecutiveIntegersDivOne

http://community.topcoder.com/stat?c=problem_statement&pm=13625&rd=16278

首先,如果记得曼哈顿距离最小值那个问题,会想起一维的情况可证,点出现在中位数那里是最小的。这里也可证明,四个点,出现在中位数位置是最小的。

题解里的做法是,试探所有让某个想减的绝对值最小的情况。

我的代码有点丑,但过了:

#include <vector>#include <algorithm>using namespace std;class TheConsecutiveIntegersDivOne {public:	int find(vector <int> numbers, int k) {		sort(numbers.begin(), numbers.end());		int d = k / 2;		int left = 0;		int sumL = 0;		for (int i = left; i < left + d; i++) {			sumL += numbers[i];		}		int sumR = 0;		int right = left + d;		if (k % 2 == 1) {			right++;		}		for (int i = right; i < right + d; i++) {			sumR += numbers[i];		}		int result = sumR - sumL - d * d;		while (right + d < numbers.size()) {			sumL += numbers[left + d];			sumL -= numbers[left];			sumR += numbers[right + d];			sumR -= numbers[right];			result = min(result, sumR - sumL - d * d);			left++;			right++;		}		return result;	}};

  

[topcoder]TheConsecutiveIntegersDivOne